Automatic lock slider for slide fasteners



March 3, 1953 F. ULRICH ET AL 2,529,912

AUTOMATIC LOCK SLIDER FOR SLIDE FASTENERS Filed April 27, 1949 4 Sheets-Sheet 1 F IE2 INVENTORS FREDEE\CK ULmcH CLAUDE ossmqea gm v March 3, 1953 F. ULRICH ET AL AUTOMATIC LOCK SLIDER FOR SLIDE FASTENERS '4 Sheets-Sheet 2 Filed April 27, 1949 FIEL'E:

F'IE.E

INVENTORS FEEDE'RKZK uumcu BYCLAUDE D\6\NGEE March 3, 1953 U H ET 2,629,912

AUTOMATIC LOCK SLIDER FOR SLIDE FASTENERS Filed April 27, 1949 4 Sheets-Sheet 3 FIE.7

IN VEN TORS FREDERKK ULRKLH h CLAUDE D\S\NGER March 3, 1953 F. ULRICH ETAL 2,629,912

AUTOMATIC LOCK SLIDER FOR suns FASTENERS Filed April '27, 1949 4 Sheets-Sheet 4 FIEJO IN V EN TORS F REDERMK ULR\ CH CLAU DE DEHMGER bodyi-ng its supported' par *the -spring ior actuating thesame, is made as a unitarypiecewith: all these-'- parts' integral and preferably shaped up irom 'sheet 'inetal. The use Patented Mar. 3, 1953 QUNITED DTEF IICE AUTOMATIC LOCKSLIDEB FOR, SLIDE (FASTENERS Frederick Ulriehjfiersey City, and-Gla iide Disinger, Sontli-Plainfield, N. J assignors to Gonmar" Products '(lorporatiomi :Newa'rlq. N.';-IJ.,'; a -corporatin of-New Jersey Application-April 27, 1949, Serial No. 89,876

ClaimS.-' (Cl."24--=-205.I4')

(This. invention relates to. an: automatic lock slideiiforl slide fasteners.

l Slidefasteners comprise two mating 'slidefastenerstringers (tapes iv'ith'mo'unted fastener elements) brought into and oilt-fof meshing or'matling riel'ationbyfthemovement of'a so-ealled ,slideri'ithrou'gh the. slide channel or. which the stringers slide ormorrefllt is necessary to'proviide a. suitable "locking. device ior' the. slider to prevent the stringers accidentally. opening C during use. ...According' to .onejtype bf lo'ek. slider," the locking .member is made so. as to bev entirely automatic in its lockingnperation. 7 The common'iormof-auto- .matic look i slider embodies a lo'ckingnmeinber on 4 the slider which ,is normally held in its locking position by a spring and which is moved against the.- aotion of the. springby a. pull elementzconnectedto thelocking member. The present in- 1 vention relates-town improved. automaticloek msliderof. this type.

More; specifically, the present invention relates No. 2,523,740, granted September-26,:-.1950;;:and,

ixth'erefore, the present? invention is? rfeatured by the icfellowingimprovements :characteristicxof. the "automatic lock .slider f: our ssaidzpending; .appli- :.cation:

1.EThe:loekslideris'composed onlypithreeelenmentspnamely, :theiislider; :thexlockingz member, and the-pull element. These three partaare so designed' andconstructed thati-theyearelcapable of being most conveniently: and quick'ly I assem- 2; T01 achieve 'this, 'the lo'ckingmember emt ts locking detentgand of: separate springs, with the oii-ffio ultiesof hanthing and slider assemblingincident theretoyis obviated;

' 3 Despite'the limitations imposed 'by thesmaH space available .on a slider-(this unitary locking member is isoiconstruoted that iarn'pleoperating leverages are? obtainedforefiecting the automatic locking operation an'd -the" unlocking" operation of the slider. In-'= accomplishing-T this, :the

lockingmember and its -mounting on the: slider are-so designed thattheldcling member leverage 5 and the effectivespring leverage eaehextends --over a substant-ialysueh as the greater "part'gibf 1 the slider'1ength;-and

" 4. The lockingmember-andfitsmouritingare :so designed that the proper a'ct-ing '(and difiep- 1 ent leverages "are made effective-Tor the-unlock- "ingand thelocking actions of the 'slidei wh'ich are inherently different the addedimprovem'ents -comprehendedand nbta-ined -by the-structure of the" invention of thepresent applica-tionbeing (aliAn automatic .loclCslidGr. of suchrugged construction is producedthat its 'ut'ilitynannotbe impairedthough'it-issizbject'toabuse;

(b) 'The. automatie'lo'ck sneer is provided with i means whereby any 'abnormal forces exerted upon the pull. device will be transmitted 't'o'i'the strong (slider b dyratherIthanTthelocking member;

(0) The f locking 1 member .,is provided with means whereby a-ny abnormal forces. applied to vthe locking ,membenas .when theis'lide'. fastener-is "subjected ..to -..sudden and extensive cross-pfill forces, are absorbedby strong coactingpartslof .the. locking member. and i slider. body, which; "also preventmhe loekingememberlfrom being, sprung out of position;

" A d) The. automatic. lo'ck slider. is .so icon'strii'etiedsthat; .balaneed'. locking, andiuhlocking. action -=wi1l.-be.provided ata11itimes;- and (e) Theisl-ideiiqbodymand the lockingmember areconstructedsothat theassemblylof .the parts -:is'-further-greatly simplified.

-To the? aceomplishmentzof theseobjeetsiand s'such obj eets .as may hereinafter,rappear,-. our in- ;vention; :directed to. the automatic flock slider wand the component =:combinations thereof ii-as :r'soughtlto besdefinedz inrthesappendedrelaimszand as described in? thei:fol1owing: jspecification: taken together with fthe '5: accompanyingzrlrawings,erin

Rig; 1 isra front? elevationalz View aoiii aislidesfastener includingtthe: automatic lock slider ofcz the '-':present 'invention;

Fig; Z-is a view: ta+ken in" cross 'section approxi- ---mately in the planes of 1me -2-'-2-of'Fig."1; shew- 50"*ing" the locking-member inns 'lo'cked -positi'on;

Fig. 3 is a perspective view of the locking member;

Fig. 4 is a plan view of ablank from which the locking member shown in Fig. 3 is formed;

Fig. 5 is a front elevational View, partly in cross-section, of the slider body;

Fig. 6 is a side elevation, partly in section, showing the manner of assembling the slider body and locking member;

Fig. 7 is a vertical cross-section illustrating the manner in which the pull is assembled with the assembled locking member and slider body;

Fig. 8 is a highly enlarged view of coacting portions of the slider body and locking member when the locking member is in locking position;

Fig. 9 is a view similar to Fig. 2 showing the position of the locking member when the slide fastener is being opened; and

Fig. 10 is a view similar to Fig. 9 showing the position of the looking member when the slide fastener is being closed.

Referring to the drawings, particularly Figs. 1 and 2, the invention is shown applied to a conventional slide fastener comprising a slider provided with an interior slide channel C, two stringers s, s, the latter each comprising a beaded tape t and spaced fastener elements 1, f, mounted thereon, said stringers being adapted to be brought into or out of meshing or mating relation by the up and down movement of the slider through the channel C of which the stringers slide or move. The slide channel C is Y-shaped, through the stem of which the fastener elements move when meshed or interengaged and through the Y-branches of which the fastener elements move when they are disengaged.

The slider of the present invention comprises a slider body S having a rear or bottom wing and a front or top wing 22 connected together at their upper ends by a neck or post 24. The bottom wing 20 comprises a body Wall provided with the inturned opposite flanges 25 and similarly the top wing 22 comprises a body wall provided with the inturned opposite flanges 21. The described construction defines the interior Y-shaped slide channel C for the slide fastener stringers. Thus far, the construction described is a conventional form of slide fastener. By moving the slider downwardly, the slide fastener is opened, and by moving the slider upwardly, the slide fastener is closed.

A locking member L is mounted on the front wing 22 of the slider body S. As best shown in Fig. 5, the front wing 22 of the slider body S preferably is provided with a pair of laterally spaced, elongated orifices 26 and 28 having their long dimensions extending parallel to the longitudinal axis of the slider body. The orifices 26 and 28 open into the slider channel C. A lug 30 is struck up from the front wing 22 intermediate the orifices 26 and 28. The lug 38 extends lengthwise of the slider, in a plane perpendicular to the horizontal surface of the front wing 22 and bridges the upper and lower sections of the front wing. The lug 38 is formed or indented so that the top thereof is provided with a pair of oppositely extending flanges 32 and 34. Within the underface of the front wing 22 there preferably are formed a pair of laterally spaced mounting seats 36 and 38. The mounting seats 36 and 38 are located in alignment with the orifices 26 and 28, respectively. If desired, a single depression may be formed within the undersurface of the front wing extending transversely a distance substantially equal to the distance between the vertical.

outside longitudinal edges of the orifices 26 and 28. The leading edges of the front wing 22 adjacent the orifices 26 and 28 are formed with thrust bearing portions or undercuts 46 and 42 beneath the plane of the upper surface of the front wing. Preferably, the undercut surfaces are formed at an angle, designated ac, of approximately thirty degrees (30) from the vertical. While the pair of undercuts 48 and 42 is preferred, one may be omitted, if desired. The slider body S thus constructed preferably is formed by a coining or stamping operation and, as is evident from the description thus far, the wings 28 and 22 have flat outer surfaces but for the projecting lug 38 on the front wing 22.

The locking member L comprises essentially a front arm 44 and two laterally spaced rear arms 46 and 48 united at their bottom ends 50 and free at their other or top ends. The arms 46 and 48 are movable resiliently with respect to the arm 44. The locking member L is provided with at least one detent adjacent its bottom end, and in the preferred construction two such detents, 52 and 54, are provided, both detents being formed to project into the slider channel C. These detents are formed one at the bottom end of the rear arm 46 and the other near the bottom end of the rear arm 48, both being staggered vertically so as to cooperate with a staggered pair of slide fastener elements I, f, of the stringers, as best shown in Fig. 2. The resilient relative motion of the front arm 44 and the rear arms 48 and 48 is accomplished by making either the front arm or the rear arms resilient. In the construction shown, the front arm 44 is formed as a rigid element and the rear arms 48 and 48 are formed as and define the resilient arms of the locking member. Each of the rear arms 46 and 48 is formed with a bend intermediate its length, such bend being in a direction towards the rigid arm 44.

The locking member L is so shaped that its front arm 44 comprises the front wall of an elongated cap which is provided with side walls 56 and 58, the resilient arms 46 and 48, and their detents 58 and 52, being formed integrally with these side walls. The cap may also be provided with top and bottom walls 60 and 62. The side walls 56 and 58 are formed to provide camming openings 64 and 86, respectively, for receiving the opposite prongs or trunnions 68 and 10 of a pendant or pull device P.

The locking member L also is formed so that the side walls 56 and 58 preferably provide a pair of laterally spaced thrust guards l2 and 14, respectively, the forward faces of which, 15 and 18, are disposed at an angle so that the thrust guards will be underhung with respect to the undercuts 40 and 42 of the slider body S. The faces 16 and 18 preferably are formed at an angle which is less or more acute than the angle at of the undercut surfaces in order to allow easy disengagement. This angle, designated y in Fig. 8, is preferably approximately fifteen degrees (15) from the It is within the scope of the invention to omit one of the thrust guards, if desired, so that one thrust guard will coact with one undercut. The paired elements, however, are preferred. The side wal s 56 and 58 also provide a pair of laterally spaced bearings and 82. The bearings 80 and 82 are formed by rearwardly inclining the edges 84 and 86 of the side walls 56 and 58, respectively, between the corner of each side wall and its thrust guards. This inclination, designated 2 in Fig. 8, is approximately five degrees; (5.)? from the; horizontal; and serves to? impartinitial tension to the. resilient arms .46 and 48 when the locking. member isassembledwith the slider body.

Preferably, the described components 'of the locking member L comprise. a unitary piece, all integrally formed. This unitary pieceis. formed. by stamping a suitable strip of metal, preferably beryllium-copper, into the shape of the. blank; shown in Fig. 4. The blank then is subjected ,to a bending operation along. the lines a, a and.b,.b,. to form the finished locking member L shown in. Fig. 3. The resilient arms 4-6 and 48. preferably are tempered for their resilient action after. the element has been shaped into its finisheddorm.

The. locking .member- L is assembled with the slider body S by placing the: locking member-in. the; position shown in Fig. 6. In this position, the resilient armsdfi and 48 ared-isposedwithinthe: orificesZd and 28 with thefront-armAA-over the. lug; 30- and theside walls 516 and 53 straddling the lug; By moving: the locking'member*L-inthe dis rection of the arrow Y,v the free. ends ofthe resilient arms 36 and 48 move into the mounting seats, and 38, the. bearings '8fiand. 82 slide forward upon the fiat, unobstructed upper. surface of. the front wing-r12, and the. faces 16 and N3 of the thrust guards l2 and M slide-beneath the. undercuts. and 42, so that the locking mem-- ber snaps into assembled positionwiththe slider body. Due to the. configuration of the resilient arms 48 anddB, the original distance "between. the ends of the resilient arms and the bearings 89 and 82, and the angularltyof, the edges 84 and. 8-5, the locking-member L assumes the position. shownin Fig. 2. In this position, the resilient arms @Eiandit are under tension, the actionbeing such that there is an initial tendency to spread the arms 4-5 and 38 with respect to the relatively rigid arm 44.. With this arrangement of theparts, the: locking member L is normally urged into locking. position. about the laterally spaced fulcra F, formed: by the. engagement of. the bearing; edges 80 and 82 with the smooth. flat upper surface of. the front wing, as shown. in Fig.2..

The. described assembly of the slider body S andwlocking member L is extremely: simpleand. inexpensive, because it does not requirea-ny ad.-

ditional operations. such. as staking. orxotherwise deforminganynpart of the-slider. body .or looking member. The'lockingmmember, because of its snap-fit assembly with the slider body, requires someeffort to dislodge it even though the pull P has: as yet not been assembled therewith. Finally, the assembly operation-is completed by locating the pull device P in the position shown in Fig. '7 and. deforming the spaced arms having theinturned ends or trunnions 68 and 70 from the solid-line. position to the dot-dash position. In this latter position,the-engagement of. the trunnionsEB-and It with the lug flanges .32 and 3 l will limit. the motion that may be imparted to -the: pullv device- P. Instead of the particular type of pull device illustrated, achainpull may be :used. whereupon the opposing open ends of the end link would. be bent under the. flanges of the lug.

With the automatic lock slider consisting. only A When-a cross-pullis exertedmponthempperendm of: the: stringers s; s; tending to-opemthe fasteners; the slider tends to move downwardly relatively to the stringers," thereby" bringing the detentsi'l and 54 ,1 if they are notin engagement with the slidefastener elements; into l-ockingrengagement with the slide fastener. elements f; f. When this takes. place, the locking' member -L soacted uporr'that the thrustguards 1-2 and "T4 engageither undercuts and 42.. Due to the overhang and und'erhang; configuration of these; enacting" elements; any direction of pressure; whi-chxwould tend to cause the locking member to move out: w-ard1y, .is;v changed to a. diagonal direction into;

- instead'lof outofitheslider body. The thrust'so directed}. as indicated. by, the. arrow '1; prevents thewIOcki-hg member from. moving to 1 unlocked; position. In. fact, increased, pressure uponthel detents .52 and 54 16 theslidefastenerelements: f, f, is transmitteditothe enacting: surfacesof'i the. thrust guards. and. undercuts .to cause the:- locking member to be forced. all'lthe. more-into. its locking position- Moreover,. the. deseribedlconstruction serves to'protect thedetents 152 and 5.4 and the end of the resilientarmsdfi andlMl from. the effects :ofsudden. and abnormallygreat. cross pull stresses. The. comparatively heavy and; strong sections of metal comprising thethrust guards l2 and 1.4 coact -with therrigid.and-strong slider body at the undercut.areas-.48: and Alto. absorb anyundue- -shock which normally would be. transmitted entirely to' the .detents; 52-. and 5.4: and. the ends ofthe resilient. arms. and 48a The provision. of. the thrustguards- 12v and-1.4 on the locking member and .the: undercut. areas. 48 and- 42 ofwthevslider; body;- with which: they ooact, supply another importantfunctionr These coactingelementsnot. only serve; to maintain and enhance lo cking action under, intensive'crosspull whichmaybeappliedeto the -fastener,-. but they also a permit movement of the slider. to be started to open or close sthe: fastener I with-little effort, though; -strong--crosspull still. is maintainedon the fastener: The? faces lifi a-nd Eliot their thrustziguards: l 2 'and'iz'lfl ancl the surfaces of the 'undercutsw lfi'andl niare'formed so that these coacthlgtsurfaces readily maydisengage .-to,-- permitt the-looking member tomock upwardly? about the; fuleraF as :soon: as: the: pull B is brought: tobear against the camming openings-i lrandl 6.6.:

Thesliders-is. :unlockedr the; usual: way. by either-"a dewnwardrpull: during opening -of the slide: fastener) or: an:.upward..pully (during .cl'osingof the slide fastener exertedon thepull: device Pi During. a: downward. or fastenereopening pull,v the pllHidBViGeP moved from.-..the position shown i'n-Flg- 2' tolthat shown insFig. 9, during which movementathetrunnions 6'8 and!!! engage and rideover the camming openingsz fil and" .551 Thus,- the locking member L is forcerft toamove outwardly against the action ofi'ts: res'ilientar-ms 48 and 48; thelocking member L2 during this: operati'on being pivoted about-the pair of laterally spaced f-ulcra-Fiormed -by the engagement of the bearing' edges 88 andBEWiththe smooth, fiat upper-surfaeeef the top wing 22 During-wins operation: the'resi-lient arms 46' and '4'8 a-re' under increased deflection; 'the arm's 4'6 and Lia-being spread'withrespect'tdthe arm Hi Theft-flora F PIOViClS'IChB rightkind and-alsothe desired length of leverage for this action During an upward orifastener-closing pull of the: pull. device P; the trunnionsfifi' and TD engage the;..camming openings 54 and; littatlthe' fbrward bends, as shown in Fig; I02" The 'fillcrasFslifi'e forward slightly upon the flat, upper surface of the front wing, and the locking member L similarly is moved outwardly and about the fulcra F to an unlocking position or to a position where the detents 52 and 54 may move over the slide fastener elements J, I. Upon manual release of the pull P, after either a downward or upward pulling operation, the locking member L automatically returns to its locking position, as shown in Fig. 2.

It will be observed from the construction hereinbefore described that the only metal working operation required to assemble the three parts of the automatic lock slider is the simple bending of the pull trunnions 68 and from their original spread-apart position to the position where their ends lie beneath the flanges 32 and 34 of the lug 30 (the dot-dash position of Fig. '7). This ordinary pull assembly operation is used in the manufacture of all the common varieties of non-lock, pin-lock, friction-lock, and wing-lock sliders and, hence, does not entail the necessity for any new type of slider assembly fixtures.

Another interesting feature of our automatic lock slider construction is that while there is no fixed connection between any of the three parts, such as a pin, indentation, or other fixed pivot, the application of any abnormal stress to which the slider may be subjected in use will not result in the disengagement or injury to any of the three parts. As hereinbefore described, the pull trunnions 68 and 10 serve to unlock the locking member when they pass against the camming openings 64 and 66. By providing the top of the lug 3D with the flanges 32 and 34, the pull trunnions engage these flanges and, hence, take up any excessive strain which ordinarily would be applied directly to the locking member L. The flanges 32 and 34 are engaged by the pull trunnions E8 and 10 after the trunnions have pressed against the camming openings 64 and 66 sufficiently to lift the locking member out of locking engagement and before the resilient arms 46 and 48 of the locking member can be unduly strained. Continued strain upon the pull P does not affect the locking member. In this way, strong heavy parts of the slider body and pull engage each other; whereas the locking member, which is less rugged than the slider body or pull, is protected from this type of abuse and cannot be dislodged from the slider body.

The presence of the lug 30 beneath the locking member L serves to protect the locking member from blows or pressure upon the top of locking member, as when the slider, as part of a fastener incorporated in a garment, is pressed by an iron or ironing machine. Though the locking member and lug are not connected together, the immediate proximity of the comparatively rigid slider body lug beneath the front arm 44 'of the locking member will serve to prevent the locking member from being unduly deformed or injured.

It further will be observed that the locking member L is perfectly symmetrical but for the offset or staggered relation of the detents 52 and 54. A central or median line cc through the locking member (such median line being shown, for convenience of illustration, on the locking member blank of Fig. 4, it being evident that the same is true for the formed locking member shown in Fig. 3), indicates that the rear resilient arms 46 and 48, the camming openings 64 and 66, the thrust guards l2 and I4, and the bearings 80 and 82 are symmetrically disposed with respect to the longitudinal axis of the member. The slider body S also is symmetrically formed in that the orifices 26 and 28, the mounting seats 36 and 38, and the undercuts 40 and 42 are symmetrically located with respect to a longitudinal median line d-d, as shown in Fig. 5. The symmetrically-formed locking member L, assembled with the symmetrically-formed front wing of the slider body S, provides balanced locking and unlocking action of the slider upon a slide fastener. The fulcra for locking and unlocking and the thrust bearings which absorb cross-pull strains, are equidistantly and laterally spaced from and athwart the longitudinal axis of the slider. Such balanced construction prevents the slider from twisting upon the chain of fastener elements though the fastener is subjected to unequal or unbalanced. cross-pull forces.

In the construction thus provided, it will be apparent that the product possesses novel and highly improved functions and characteristics. While we have shown and described a preferred form of our lock slider, it will be apparent that changes may be made therein without departing from the principles thereof and the spirit of the invention defined in the following claims.

We claim:

1. An automatic lock slider for a slide fastener comprising a slider body having front and rear wings spaced to provide a slider channel for the slide fastener stringers, a locking member mounted in position on the front wing of said slider body, and a pull device for engaging said locking member, said front wing being formed with a pair of laterally spaced orifices opening into the slider channel and a lug intermediate said orifices, said lug being provided at the top thereof with a pair of oppositely extending flanges, said locking member comprising a front arm and a pair of laterally spaced rear arms connected together at their bottom ends and free at their top ends, said front and rear arms being resiliently movable with respect to each other, at least one of said rear arms being provided with a detent, said rear arms being disposed within said orifices with the free ends thereof mounted beneath the front slider wing, and the free end of the front arm bearing upon the upper surface of the front wing, the front and rear arms being spread with respect to each other to normally urge the locking member to locking position, the upper surface of said front wing providing a fulcrum for unlocking the locking member when the pull device is moved against the locking member, said locking member being insertable in its said position on said front slider wing with a snap-fit and with the locking member straddling said lug and with said locking member being capable of a slight longitudinal movement on said slider body and relatively to said lug, and said pull device serving as the only means for permanently securing said locking member to said slider body, said pull device engaging said lug flanges to limit the force which may be applied directly to the locking member.

2. An autom-atic'lock slider for a slide fastener comprising a slider body having front and rear wings spaced to provide a slider channel for the slide fastener stringers, a locking member mounted in position on the front wing of said slider body, and a pull device for engaging said locking member, said front wing being formed with a pair of laterally spaced orifices opening into the slider channel and a lug intermediate said orifices, and a thrust bearing portion formed in said front wing adjacent one of said orifices, said lug being provided at the top thereof with a pair of oppositely extending flanges, said looking member comprising a front 'arm and a pair of laterally spaced rear arms connected together at their bottom ends and free at their top ends, and a thrust guard, said front and rear arms being resiliently movable with respect to each other, at least one of said rear arms being provided with a detent, said rear'arms being disposed within said orifices with 'the free ends thereof mounted beneath the front slider wing, the free end o'fthe front arm bearing upon the upper surface of the front "wing, the front "and rear arms being spread with respect to each other to normally urge the locking member to locking position, the upper surface of said front wing providing a fulcrum for unlocking the locking member when the pull device is moved against the locking member, said locking member being insertable in its said position on said front slider wing with a snap-fit and with the locking member straddling said lug and with said locking member being capable of a slight longitudinal movement on said slider body and relatively to said lug, said pull device serving as the only means for permanently securing said locking member to said slider body, said pull device engaging said lug flanges to limit the force which may be applied directly to the locking member, and said thrust guard engaging said thrust bearing portion of the slider body when cross-pull is applied to the fastener.

3. An automatic lock slider for a slide fastener comprising a slider body having front and rear wings spaced to provide a slider channel for the slide fastener stringers, a locking member mounted in position on the front wing of said slider body, and a pull device for engaging said locking member, said front wing being formed with a pair of laterally spaced orifices opening into the slider channel and a lug intermediate said orifices, said lug being provided at the top thereof with a pair of oppositely extending flanges and a pair of laterally spaced mounting seats formed within the underface of the front wing each in alignment with each of said orifices, said locking member comprising a front arm and a pair of laterally spaced rear arms connected together at their bottom ends and free at their top ends, said front and rear arms being resiliently movable with respect to each other, at least one of said rear arms being provided with a detent, said rear arms being disposed within said orifices with the free ends thereof mounted in said mounting seats, the free end of the front arm bearing upon the upper surface of the front wing, the front and rear arms being spread with respect to each other to normally urge the locking member to locking position, the upper surface of said front wing providing a fulcrum for unlocking the locking member when the pull device is moved against the locking member, said locking member being insertable in its said position on said front slider wing with a snap-fit and with the locking member straddling said lug and with said locking member being capable of a slight longitudinal movement on said slider body and relatively to said lug, and said pull device serving as the only means for permanently securing said locking member to said slider body, said pull device engaging said lug flanges to limit the force which may be applied directly to the locking member.

4. An automatic lock slider for a slider fastener comprising a slider body having front and rear wings spaced to provide a slider channel for the slide fastener stringers, an integrally formed locking member mounted in position on the front wing of said slider body, and 'a'pull device for engaging said locking membensalid front wing being formed with a pair of laterally spaced orifices opening into the slider channel and a lug intermediate said orifices, said 111% being provided atthe top thereof with apair of oppositely extending flanges, a'pair of laterally spaced mounting seats formed within the underface of the front wing each in'a'lignrnent with each of said orifices, and an undercut formed "in said front wing adjacent one of said orifices, said locking member comprising a front arm and a pair of laterally spaced rear arms connected together at theirbqttom ends and free at their top-endsgandathrust-guard, said front and rear arms being -resi1iently=movable with respect to each other, at least one of said rear arms being provided with a detent, said rear arms being disposed within said orifices with the free ends thereof mounted in said mounting seats, the free end of the front arm bearing upon the upper surface of the front wing, the front and rear arms being spread with respect to each other to normally urge the locking member to locking position, the upper surface of said front wing providing a fulcrum for unlocking the locking member when the pull device is moved against the locking member, said locking member being insertable in its said position on said front slider wing with a snap-fit and with the locking member straddling said lug and with said locking member being capable of a slight longitudinal movement on said slider body and relatively to said lug, said pull device serving as the only means for permanently securing said locking member to said slider body, said pull device engaging said lug flanges to limit the force which may be applied directly to the locking member, and said thrust guard engaging said undercut when cross-pull is applied to the fastener.

5. An automatic lock slider for a slide fastener comprising a slider body having front and rear wings spaced to provide a slider channel for the slide fastener stringers, an integrally formed locking member mounted in position on the front Wing of said slider body, and a pull device for engaging said locking member, said front wing being formed with a pair of laterally spaced orifices opening into the slider channel and a lug intermediate said orifices, said lug being provided at the top thereof with a pair of oppositely extending flanges, a pair of laterally spaced mounting seats formed within the underface of the front wing each in alignment with each of said orifices, and a pair of laterally spaced undercuts formed in said front wing each adjacent each of said orifices, said locking member comprising a front wall and a pair of laterally spaced side walls providing a front arm and a pair of rear arms, respectively, connected together at their bottom ends and free at their top ends, a thrust guard and a camming opening formed in each of said side walls, said front and rear arms being resiliently movable with respect to each other, each of said rear arms being provided with a detent, said rear arms being disposed within said orifices with the free ends thereof mounted in said mounting seats, the free end of the front arm bearing upon the upper surface of the front wing, the front and rear arms being spread with respect to each other to normally urge the looking member to locking position, the upper surface of said front wing providing a fulcrum for 11 unlocking the locking member when the pull device is moved against the camming openings, said locking member being insertable in its said position on said front slider wing with a snapfit and with the locking member straddling said lug and with said locking member being capable of a slight longitudinal movement on said slider body and relatively to said lug, said pull device serving as the only means for permanently securing said locking member to said slider body, said pull device engaging said lug flanges to limit the force which may be applied directly to the locking member and said thrust guards engaging said undercuts when cross-pull is applied to the fastener.

FREDERICK ULRICH. CLAUDE DISINGER.

12 REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,853,634 Norton Apr. 12, 1932 2,222,529 Dahlin Nov. 19, 1940 2,405,883 Gould Aug. 13, 1946 2,521,453 Disinger et al Sept. 5, 1950 2,523,740 Ulrich et al Sept. 26, 1950 

